:root{
  --primary:#4f46e5;
  --primary-dark:#4338ca;
  --primary-soft:#eef2ff;
  --ink:#1e293b;
  --muted:#64748b;
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --border:#e2e8f0;
  --radius:12px;
  --shadow:0 2px 10px rgba(15,23,42,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);line-height:1.65;background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 1rem}
.narrow{max-width:760px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:1.35rem;font-weight:800;color:var(--ink);letter-spacing:-.02em}
.logo span{color:var(--primary)}
.logo:hover{text-decoration:none}
.site-nav{display:flex;gap:1.5rem}
.site-nav a{color:var(--muted);font-weight:600;font-size:.95rem}
.site-nav a:hover,.site-nav a.active{color:var(--primary);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;
  padding:.4rem .6rem;font-size:1.1rem;cursor:pointer;color:var(--ink);line-height:1}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,var(--primary-soft),#fff);padding:3.5rem 0 3rem;text-align:center;border-bottom:1px solid var(--border)}
.hero h1{font-size:2.4rem;letter-spacing:-.02em;margin-bottom:.75rem}
.hero p{color:var(--muted);font-size:1.1rem;max-width:640px;margin:0 auto 1.5rem}

/* ---------- Buttons & forms ---------- */
.btn{display:inline-block;background:var(--primary);color:#fff;border:none;border-radius:8px;
  padding:.7rem 1.4rem;font-size:1rem;font-weight:700;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--primary-dark);text-decoration:none;color:#fff}
.btn-secondary{background:#fff;color:var(--primary);border:2px solid var(--primary)}
.btn-secondary:hover{background:var(--primary-soft)}
.btn-row{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1rem}
label{display:block;font-weight:600;margin:.9rem 0 .3rem;font-size:.95rem}
input[type=text],input[type=number],input[type=url],input[type=email],select,textarea{
  width:100%;padding:.65rem .8rem;border:1px solid var(--border);border-radius:8px;
  font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);outline-offset:1px;border-color:var(--primary)}
textarea{min-height:140px;resize:vertical}
input[type=range]{width:100%;accent-color:var(--primary)}
input[type=checkbox]{width:1.1rem;height:1.1rem;accent-color:var(--primary)}
.checkline{display:flex;align-items:center;gap:.5rem;margin:.5rem 0;font-weight:500}
.checkline label{margin:0;font-weight:500}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 1rem}
.hint{font-size:.85rem;color:var(--muted)}

/* ---------- Tool cards (homepage) ---------- */
.section{padding:2.5rem 0}
.section h2{font-size:1.6rem;margin-bottom:.4rem;letter-spacing:-.01em}
.section-sub{color:var(--muted);margin-bottom:1.5rem}
.category-title{font-size:1.15rem;margin:2rem 0 .9rem;color:var(--ink);
  border-bottom:2px solid var(--primary-soft);padding-bottom:.4rem}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}
.tool-card{display:block;background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:1.25rem;box-shadow:var(--shadow);transition:transform .12s,box-shadow .12s}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 6px 20px rgba(15,23,42,.1);text-decoration:none}
.tool-card h3{font-size:1.05rem;color:var(--ink);margin-bottom:.35rem}
.tool-card p{font-size:.9rem;color:var(--muted);line-height:1.5}

/* ---------- Tool page ---------- */
.tool-hero{padding:2rem 0 0}
.tool-hero h1{font-size:2rem;letter-spacing:-.02em;margin-bottom:.5rem}
.tool-hero .lede{color:var(--muted);font-size:1.05rem;max-width:720px}
.tool-box{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.5rem;margin:1.5rem 0}
.result-box{background:#fff;border:1px solid var(--border);border-radius:8px;
  padding:1.25rem;margin-top:1.25rem}
.result-box h3{font-size:1rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.5rem}
.big-number{font-size:2rem;font-weight:800;color:var(--primary)}
.kv{display:flex;justify-content:space-between;padding:.45rem 0;border-bottom:1px dashed var(--border);font-size:.95rem}
.kv:last-child{border-bottom:none}
.kv strong{font-weight:700}
.content-block{margin:2rem 0}
.content-block h2{font-size:1.4rem;margin:1.75rem 0 .6rem}
.content-block h3{font-size:1.1rem;margin:1.25rem 0 .4rem}
.content-block p,.content-block li{margin-bottom:.6rem}
.content-block ul,.content-block ol{padding-left:1.4rem}

/* ---------- Ad slots ---------- */
.ad-slot{border:2px dashed #cbd5e1;border-radius:8px;background:#f8fafc;
  display:flex;align-items:center;justify-content:center;flex-direction:column;
  color:#94a3b8;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;
  margin:1.5rem 0;padding:1rem;min-height:90px;text-align:center}
.ad-slot small{font-size:.7rem;letter-spacing:.02em;text-transform:none;color:#b0bcc9}
.ad-leaderboard{min-height:110px}
.ad-incontent{min-height:250px}

/* ---------- FAQ ---------- */
.faq details{border:1px solid var(--border);border-radius:8px;margin-bottom:.6rem;background:#fff}
.faq summary{padding:.9rem 1.1rem;font-weight:700;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+ ";color:var(--primary);font-weight:800}
.faq details[open] summary::before{content:"– "}
.faq details p{padding:0 1.1rem 1rem;color:var(--muted)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border);margin-top:3rem;padding:2rem 0;background:var(--bg-soft)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.footer-links{display:flex;gap:1.25rem}
.footer-links a{color:var(--muted);font-size:.9rem}
.copyright{color:var(--muted);font-size:.85rem;margin-top:.75rem}

/* ---------- Invoice preview ---------- */
#invoice-preview{background:#fff;border:1px solid var(--border);border-radius:8px;padding:2rem;margin-top:1rem}
#invoice-preview .inv-head{display:flex;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}
#invoice-preview table{width:100%;border-collapse:collapse;margin:1rem 0}
#invoice-preview th,#invoice-preview td{border:1px solid var(--border);padding:.5rem .7rem;text-align:left;font-size:.92rem}
#invoice-preview th{background:var(--bg-soft)}
#invoice-preview .inv-totals{margin-left:auto;max-width:280px}
#invoice-preview .inv-totals .kv{font-size:.92rem}

/* ---------- Misc ---------- */
.badge{display:inline-block;background:var(--primary-soft);color:var(--primary);
  font-size:.75rem;font-weight:700;padding:.2rem .6rem;border-radius:999px;margin-bottom:.5rem}
.qr-result,.img-result{text-align:center;margin-top:1rem}
.qr-result img,.img-result img{border:1px solid var(--border);border-radius:8px;max-width:100%}
.winner-flash{font-size:1.8rem;font-weight:800;color:var(--primary);text-align:center;
  padding:2rem 1rem;min-height:120px;display:flex;align-items:center;justify-content:center}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.75rem;margin-top:1rem}
.stat{background:#fff;border:1px solid var(--border);border-radius:8px;padding:.9rem;text-align:center}
.stat .num{font-size:1.5rem;font-weight:800;color:var(--primary)}
.stat .lbl{font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.color-row{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.color-row input[type=color]{width:52px;height:40px;border:1px solid var(--border);border-radius:8px;padding:2px;background:#fff}

/* ---------- Responsive ---------- */
@media (max-width:720px){
  .hero h1{font-size:1.8rem}
  .tool-hero h1{font-size:1.6rem}
  .form-grid{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;
    flex-direction:column;padding:1rem;border-bottom:1px solid var(--border);gap:0}
  .site-nav a{padding:.7rem 0;border-top:1px solid var(--bg-soft)}
  .site-header.nav-open .site-nav{display:flex}
  .tool-box{padding:1rem}
}

/* Tool directory: search + category pills */
.tool-search-wrap { margin: 0 0 0.9rem; }
#tool-search {
  width: 100%; max-width: 560px; padding: 0.7rem 1.1rem;
  font-size: 1rem; color: var(--ink);
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg);
}
#tool-search:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
.cat-pills { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.6rem; }
.pill {
  padding: 0.45rem 1rem; font-size: 0.9rem; cursor: pointer;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg); color: var(--ink);
}
.pill:hover { border-color: var(--primary); }
.pill.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.no-results { padding: 2rem 0; text-align: center; color: var(--muted); }

/* Contact form: honeypot + status messages */
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }
.form-status:empty { display: none; }
.form-status { margin-top: 1rem; padding: 0.8rem 1rem; border-radius: var(--radius); background: var(--bg-soft); border: 1px solid var(--border); }
.form-status.ok { border-color: #22c55e; }
.form-status.err { border-color: #ef4444; }

/* Batch 2 tool components */
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--ink); }
.btn-ghost:hover { border-color: var(--primary); }
.table-wrap { overflow-x: auto; margin-top: 1rem; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.data-table th, .data-table td { text-align: right; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data-table th:first-child, .data-table td:first-child { text-align: left; }
.data-table thead th { color: var(--muted); font-weight: 600; }
.color-preview { height: 90px; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 1rem; }
.countdown-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; }
.countdown-cell { text-align: center; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.9rem 0.25rem; }
.countdown-cell span { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.25rem; }
.plain-list { list-style: none; padding: 0; margin: 0; }
.plain-list li { padding: 0.45rem 0; border-bottom: 1px solid var(--border); font-size: 0.95rem; }

/* Batch 3 components */
.password-row { display: flex; gap: 0.5rem; }
.password-row input { flex: 1; }
.strength-meter { height: 10px; border-radius: 999px; background: var(--bg-soft); border: 1px solid var(--border); margin: 0.9rem 0 0.4rem; overflow: hidden; }
.strength-fill { height: 100%; width: 0%; border-radius: 999px; transition: width 0.25s ease, background 0.25s ease; }
.mode-toggle { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.timer-display { font-size: 3.2rem; font-weight: 700; text-align: center; letter-spacing: 0.04em; margin: 0.6rem 0; font-variant-numeric: tabular-nums; }
.timer-cs { font-size: 1.6rem; color: var(--muted); }
.timer-controls { justify-content: center; margin: 0.8rem 0 1.2rem; }
.lap-list li { padding: 0.45rem 0; border-bottom: 1px solid var(--border); }
.rule-row { display: grid; grid-template-columns: 1fr 1fr 2fr auto; gap: 0.5rem; margin-bottom: 0.6rem; align-items: center; }
@media (max-width: 640px) { .rule-row { grid-template-columns: 1fr 1fr; } }
.favicon-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.9rem; margin: 1rem 0; }
.favicon-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.9rem; text-align: center; background: var(--bg); }
.favicon-card img { image-rendering: auto; margin-bottom: 0.4rem; border: 1px solid var(--border); border-radius: 6px; }
.favicon-card p { font-size: 0.85rem; color: var(--muted); margin: 0 0 0.6rem; }
.palette-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.6rem; margin: 1.1rem 0; }
@media (max-width: 640px) { .palette-row { grid-template-columns: repeat(5, 1fr); gap: 0.35rem; } }
.swatch { position: relative; border-radius: var(--radius); min-height: 120px; cursor: pointer; display: flex; align-items: flex-end; justify-content: center; border: 1px solid rgba(0,0,0,0.12); }
.swatch-hex { background: rgba(255,255,255,0.92); color: #111; font-size: 0.72rem; font-weight: 700; padding: 0.15rem 0.4rem; border-radius: 6px; margin-bottom: 1.7rem; letter-spacing: 0.03em; }
.swatch-lock { position: absolute; bottom: 0.4rem; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,0.55); color: #fff; font-size: 0.68rem; padding: 0.15rem 0.55rem; border-radius: 999px; cursor: pointer; }
.swatch.locked { outline: 3px solid var(--primary); outline-offset: 2px; }

/* Batch 4 components */
.gpa-row{display:grid;grid-template-columns:1fr 110px 100px;gap:.5rem;margin-bottom:.5rem}
@media (max-width:560px){.gpa-row{grid-template-columns:1fr 90px 80px}}
.quote-box{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);padding:2rem 1.5rem;margin-bottom:1rem;text-align:center}
.quote-text{font-size:1.35rem;font-weight:600;line-height:1.5}
.quote-author{color:var(--muted);margin-top:.75rem;font-size:1rem}
.eight-ball{width:220px;height:220px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#475569,#0f172a 70%);display:flex;align-items:center;justify-content:center;margin:1.5rem auto;box-shadow:var(--shadow)}
.eight-ball span{width:110px;height:110px;border-radius:50%;background:#fff;color:var(--ink);display:flex;align-items:center;justify-content:center;font-size:3rem;font-weight:800}
.eight-ball.shake{animation:ballshake .6s}
@keyframes ballshake{0%,100%{transform:translateX(0) rotate(0)}20%{transform:translateX(-14px) rotate(-8deg)}40%{transform:translateX(12px) rotate(6deg)}60%{transform:translateX(-8px) rotate(-4deg)}80%{transform:translateX(6px) rotate(3deg)}}
.eight-answer{min-height:2.5rem;text-align:center;font-size:1.3rem;font-weight:700;color:var(--primary);margin:.5rem 0 1rem}
.gradient-preview{height:200px;border-radius:var(--radius);border:1px solid var(--border);margin:1.25rem 0}
.stop-row{display:grid;grid-template-columns:1fr 1fr auto;gap:.5rem;align-items:end;margin-bottom:.5rem}
.shadow-preview-wrap{display:flex;justify-content:center;padding:2.5rem 1rem;background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius);margin:1.25rem 0}
#bs-demo{width:150px;height:150px;background:#fff;border-radius:12px}

/* Batch 5 components */
.split-pane { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 760px) { .split-pane { grid-template-columns: 1fr 1fr; } }
.md-label { display: block; font-weight: 600; margin-bottom: 0.4rem; }
.md-preview { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; min-height: 220px; background: var(--bg); overflow-wrap: break-word; }
.md-preview h1, .md-preview h2, .md-preview h3 { margin: 0.6em 0 0.4em; }
.md-preview h1 { font-size: 1.5rem; } .md-preview h2 { font-size: 1.3rem; } .md-preview h3 { font-size: 1.1rem; }
.md-preview p { margin: 0.5em 0; }
.md-preview ul, .md-preview ol { margin: 0.5em 0 0.5em 1.4em; }
.md-preview code { background: var(--bg-soft); padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.9em; }
.md-preview pre { background: var(--bg-soft); padding: 0.8rem; border-radius: var(--radius); overflow-x: auto; }
.md-preview pre code { background: none; padding: 0; }
.md-preview blockquote { border-left: 3px solid var(--border); margin: 0.6em 0; padding: 0.2em 0.8em; color: var(--muted); }
.md-preview a { color: var(--primary); }
.md-preview hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }
.code-output { white-space: pre-wrap; word-break: break-word; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9rem; background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.8rem; min-height: 3rem; }
.code-output mark { background: #fde047; border-radius: 2px; }
.team-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 0.8rem 1rem; margin-bottom: 0.8rem; }
.team-card h4 { margin: 0 0 0.4rem; }
.debt-row { display: grid; gap: 0.6rem; grid-template-columns: 1fr; border: 1px solid var(--border); border-radius: var(--radius); padding: 0.8rem; margin-bottom: 0.8rem; }
@media (min-width: 640px) { .debt-row { grid-template-columns: 2fr 1fr 1fr 1fr auto; align-items: end; } }

/* Batch 6 components */
.beat-dots{display:flex;gap:.6rem;justify-content:center;margin:1rem 0}
.beat-dot{width:18px;height:18px;border-radius:50%;background:var(--bg-soft);border:1px solid var(--border);transition:background .05s}
.beat-dot.on{background:var(--primary);border-color:var(--primary)}
.beat-dot.accent.on{background:#dc2626;border-color:#dc2626}
.sim-grid{display:grid;gap:1rem;margin-top:1rem;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.sim-grid canvas{width:100%;border:1px solid var(--border);border-radius:8px}
.sim-grid p{margin-bottom:.4rem}
.name-item{display:flex;justify-content:space-between;align-items:center;gap:.5rem}
.name-item button{flex-shrink:0}